<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0"></el-col>
      <el-col :span="12" :xs="24">
        <!-- 登录的表单 -->
        <el-form
          class="login_form"
          :model="loginForm"
          :rules="rules"
          ref="loginForms"
        >
          <h1>Hello</h1>
          <h2>欢迎来到XXXX管理系统</h2>
          <el-form-item prop="username">
            <el-input
              :prefix-icon="User"
              v-model="loginForm.username"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              type="password"
              :prefix-icon="Lock"
              v-model="loginForm.password"
              show-password
            ></el-input>
          </el-form-item>
          <el-form-item>
            <el-button
              :loading="loading"
              class="login_btn"
              type="primary"
              size="default"
              @click="login"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>
<script setup lang="ts">
import { User, Lock } from '@element-plus/icons-vue'
import { reactive, ref } from 'vue'
import useUserStore from '@/store/modules/user'
import { useRouter, useRoute } from 'vue-router'
import { ElNotification } from 'element-plus'
import { getTime } from '@/utils/time'
let useStore = useUserStore()

//获取el-form组件实例
let loginForms = ref()

//获取路由器
let $router = useRouter()
//路由对象
let $route = useRoute()

//定义变量控制按钮加载效果
let loading = ref(false)

//收集账号密码数据
let loginForm = reactive({
  username: 'admin',
  password: '111111',
})

/**
 * 登录方法----开始
 */
const login = async () => {
  try {
    //加载效果:开始加载
    loading.value = true
    //保证全部表单相校验通过再发请求
    const isValid = await loginForms.value.validate()
    await useStore.userLogin(loginForm)
    //编程式导航跳转到展示数据首页
    //判断登录的时候,路由路径当中是否有query参数，如果有就往query参数跳转，没有跳转到首页
    let redirect: any = $route.query.redirect
    $router.push({ path: redirect || '/' })
    //登录成功提示信息
    ElNotification({
      type: 'success',
      message: '欢迎回来',
      title: `HI ${getTime()}好`,
    })
    //登录成功加载效果也消失
    loading.value = false
  } catch (error) {
    //登录失败加载效果消息
    loading.value = false
    //登录失败的提示信息
    console.log('error', error)
    ElNotification({
      type: 'error',
      message: (error as Error).message,
      // message: "登录失败"
    })
  } finally {
    // 不管是否成功，都关闭加载效果
    loading.value = false
  }
}

/**
 * 登录方法----结束
 */

/**
 * 表单校验----开始
 */

/**
 * 自定义校验规则函数
 * @param rule 即为校验规则对象
 * @param value 即为表单元素文本内容
 * @param callback 如果符合条件callBack放行通过即为,如果不符合条件callBack方法,注入错误提示信息
 */
const validatorUserName = (rule: any, value: any, callback: any) => {
  if (value.length >= 5) {
    callback()
  } else {
    callback(new Error('账号长度至少5位'))
  }
}

//自定义密码校验规则
const validatorPassword = (rule: any, value: any, callback: any) => {
  if (value.length >= 6) {
    callback()
  } else {
    callback(new Error('密码长度至少六位'))
  }
}

//表单校验规则对象
const rules = {
  /**
   * trigger两个值
   * blur: 失去焦点触发
   * change： 文本变化触发
   */
  username: [
    /**
     * 规则对象属性：
     * required,代表这个字段务必要校验的
     * min:文本长度至少多少位
     * max:文本长度最多多少位
     * message:错误的提示信息
     * trigger:触发校验表单的时机 change->文本发生变化触发校验,blur:失去焦点的时候触发校验规则
     */
    // { required: true, message: '用户名不能为空', trigger: 'blur' },
    // { required: true, min: 5, max: 10, message: '账号长度至少是5位', trigger: 'change' },
    //自定义校验规则
    { validator: validatorUserName, trigger: 'change' },
  ],
  password: [
    // { required: true, min: 6, max: 15, message: '密码长度至少是6位', trigger: 'change' },
    { validator: validatorPassword, trigger: 'change' },
  ],
}

/**
 * 表单校验----结束
 */
</script>
<style scoped lang="scss">
.login_container {
  width: 100%;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat;
  background-size: cover;

  .login_form {
    position: relative;
    width: 80%;
    top: 30vh;
    background: url('@/assets/images/login_form.png') no-repeat;
    background-size: cover;
    padding: 40px;

    h1 {
      color: white;
      font-size: 40px;
    }

    h2 {
      font-size: 20px;
      color: white;
      margin: 20px 0px;
    }

    .login_btn {
      width: 100%;
    }
  }
}
</style>
